Bolt-anchor.



J. E. OGDEN.

BOLT ANCHOR. APPLICATION FILED JUNE 24, 1910.

989,400, Patented Apr. 11-, 1911.

:42 TTORNEY I-NVENTOR ii .lQ.

JOHN EDWARD OGDEN, 0F BROOKLYN, NEW YORK.

BOLT-ANCHOR.

Specification of Letters Patent.

Patented Apr. 11, 1911.

Application filed June 24, 1910. Serial No. 568,649.

' To all whom it may concern:

Be it known that I, JOHN EDWARD OGDEN, a citizen of the United States ofAmerica, and a resident of the borough of Brooklyn, county of Kings, andState of New York, have invented certain new and useful Improvements inBolt-Anchors, of which the following is a specification, reference beinghad to the accompanying drawings, forming a part thereof.

My invention relates to improvements in bolt anchors of the characteremployed as a means for securing objects to stone or brick walls or thelike in which the material of which they are composed is not adapted todirectly receive threaded bolts, and my invention relates particularlyto that class of bolt anchor formed of comparatively soft metal such aslead or lead composition in which an unthreaded bore is employed, thebolt employed therewith being adapted to force a thread therein as it isforced into the anchor while simultaneously expanding the walls of theanchor to force the same into intimate contact with the walls of thehole in which it is received. 7

My invention consists in improvements in the form, shape, andconfiguration of the interior bore of soft metal anchors of theforegoing description, wherein a better hold is afiorded for the boltand the surfaces are presented in the best form to the threaded portionsof the bolt to themselves receive thread impressions.

My invention consists, first, in forming the bore in part cylindricaland in part polygonal, the former merging into the latter; second, informing the bore either in whole or in part triangular in cross section.Preferably the bore merges from a triangular form in cross section to acylindrical form, but so far as I am aware it is broadly new to make thebore triangular in cross section either in whole or in part.

In order that my invention'may be thoroughly understood, I will nowproceed to describe certain embodiments thereof, having reference to theaccompanying drawings illustrating the same, and will then pointout thenovel features in claims.

In the drawings: Figure 1 is a view in central longitudinal sectionthrough an anchor constructed in accordance with my invention, the borethereof being in part cylindrical and in part triangular. Fig. 2 is anend view of the same looking toward the inner end. Fig. 3 is a view inlongitudinal section through an anchor, the inner bore of which istriangular 1n cross section throughout the entire length, the said borebeing tapered from one end to the other. Fig. a is an end View of thesame looking toward the inner end of the anchor. Fig. 5 is a similarView to Fig. 4: except that the sectional area of the bore is uniformthroughout. Fig. 6 is an end view of the same. Fig. 7 is a view incentral longitudinal section through an anchor in which a portion of thebore is cylindrical and the remainder is hexagonal in transversesection. Fig. 8 is an end view of the same looking toward the inner endof the anchor. Fig. 9 is an end View of the same looking toward. theouter end of the anchor.

Referring first of all to the anchor shown in Figs. 1 and 2, the samecomprises a shell having a longitudinal bore therethrough, the portionnearer the outer end being cylindrical as at 10, and the remainingportion being triangular in transverse section as at 11. The triangularportion of the bore is gradually reduced from the outer toward the innerend and the size of the triangle is such that a circumscribed circlewould be greater than the diameter of the portion 10, while an inscribedcircle would be less. hen a bolt is inserted in the cylindrical portion10 the same not only forms a means by which the end of the bolt will beguided toward the polygonal portion, but by reason of the fact that thecylindrical portion merges into the polygonal portion it will actuallyform a means by which the threads may be gradually started at theapproach end of the polygonal portion. So far as this feature of myinvention is concerned the portion other than the cylindrical portion ofthe bore may be of various polygonal forms in transverse section, and inFigs. 7 8, and 9 I have shown the same as hexagonal in form. I havefound, however, that the triangular form of bore is the best form forthe shells, for many reasons, in that it presents the fewest number ofsides possible where every side is utilized; it presents a threepointform of support for the bolt such as best tends to centralize the boltand keep it from drifting; and large clearance spaces are formed betweenthe surfaces which engage the bolt, into which metal, cut away by theaction of the bolt, may be received, thereby preventing it from fillingthe bore, jamming the bolt and causing the threads formed in the shellto be mutilated, scored, or stripped.

In Fig. 3 I have shown a shell in which the bore is of triangular formthroughout, the same being slightly tapered from end to end, while inFig. 5 I have shown a form in which the bore is triangular in crosssection but of the same size from end to end.

\Vhat I claim is:

1. A bolt anchor comprising an expansible shell provided with alongitudinal bore the walls of which are arranged for direct coactionwith a threaded bolt, a portion of the said bore being substantiallycylindrical and the remaining portion thereof being polygonal in crosssection, the two portions merging the one into the other.

2. A bolt anchor comprising an expansible shell provided with alongitudinal bore the walls of which are arranged for direct coactionwith a threaded bolt, a portion of the bore being substantiallycylindrical and the remaining portion thereof being polygonal in crosssection, the polygonal portion being of gradually reduced diameter fromthe point where it connects with the cylindrical portion toward theopposite end of the shell, the said cylindrical and polygonal portionsmerging the one into the other.

3. A bolt anchor comprising an expansible shell provided with alongitudinal bore the walls of which are arranged for direct coactionwith a threaded bolt, a portion of the said bore being substantiallycylindrical and the remaining portion thereof being triangular in crosssection, the two portions merging the one into the other.

4. A bolt anchor comprising an expansible shell provided with alongitudinal bore the walls of which are arranged for direct coactionwith a threaded bolt, a portion of the said bore being substantiallycylindrical and the remaining portion thereof being triangular in crosssection, the triangular portion being of gradually reduced diameter fromthe point where it connects with the cylindrical portion toward theopposite end of the shell, the said cylindrical and triangular portionsmerging the one into the other.

5. A bolt anchor comprising an expansible shell provided with alongitudinal bore the walls of which are arranged for direct coactionwith a threaded bolt, a portion of the said bore being substantiallycylindrical and the remaining portion thereof being polygonal in crosssection, the two portions merging the one into the other, the crosssectional area of the polygonal portion of the bore being such that aninscribed circle is of smaller diameter than the diameter of thecylindrical portion of the bore and the diameter of a circumscribedcircle is greater than the diameter of the said cylindrical port-ion.

A bolt anchor comprising an expansible shell provided with alongitudinal bore the walls of which are arranged for direct coactionwith a threaded bolt, a portion of the said bore being substantiallycylindrical and the remaining portion thereof being polygonal in crosssection, the polygonal portion being of gradually reduced diameter fromthe point where it connects with the cylindrical portion toward theopposite end of the shell, the said cylindrical and polygonal portionsmerging the one into the other, the cross sectional area of thepolygonal portion at its point of greatest size being such that thediameter of an inscribed circle will be less than the diameter of thecylindrical portion of the bore and the diameter of a circumscribedcircle will be greater than the diameter of the said cylindricalportion.

7. A bolt anchor comprising an expansible shell provided with alongitudinal bore the walls of which are arranged for direct coactionwith a threaded bolt, a portion of the said bore being substantiallycylindrical and the remaining portion thereof being triangular in crosssection, the two portions merging the one into the other, the crosssectional area. of the triangular portion of the bore being such thatthe diameter of an inscribed circle will be less than the diameter ofthe cylindrical portion of the bore and the diameter of a circumscribedcircle will be greater than the diameter of the said cylindrical portionof the bore. k

8. A bolt anchor comprising an expansible shell provided with alongitudinal bore the walls of which are arranged for direct coactionwith a threaded bolt, a portion of the said bore being substantiallycylindrical and the remaining portion thereof being triangular in crosssection, the triangular portion being of gradually reduced diameter fromthe point where it connects with the cylindrical portion toward theopposite end of the shell, the said cylindrical and triangular portionsmerging the one into the other, the cross sectional area of thetriangular portion of the bore at its point of greatest area being suchthat the diameter of an inscribed circle will be less than the diam-eterof the cylindrical portion of the bore and the diameter of acircumscribed circle will be greater than the diameter of the saidcylindrical portion of the bore.

JOHN EDWARD OGDEN.

Vitnesses:

JAooB ISLER, CHAS. V. HEMSTREET.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. 0. i V

